As for the initial unban, a bug had caused the "successful appeal" macro to apply - but it did not actually unban your account. Hence the confusion.
We are definitely working on improving this and the experience - and I'd like to apologize for the quite honestly shitty experience you had. 2020 has been a wild year for us, and we are still playing catch up operationally on some things - with the rapid surge of usage on the platform.
Unfortunately the people handling these appeals don't have all the information necessary to explain exactly why you were banned - and as a general policy we try to keep those exact details under wraps to thwart attempts from people to try and reverse engineer / circumvent our anti spam. (Of which there are many, so... so many people trying to do this.)
We are working hard on improving our process around this - but it's a rather gargantuan effort. From both the improvement of automation and tooling, and also staffing in general. But we are actively working on it - and a lot of my day job is to make sure we are handling these kinds of cases in a timely manner and also making sure nothing slips through the cracks due to a bug like your tickets have.